MAPPING UWB SIGNAL PROCESSING ONTO SILICON

In this paper, we study the performance of a transmitted reference (TR) system corrupted by a single tone interferer in a multipath noise-free channel. By employing “frequency wrapping”, a new architecture, the quadrature downconversion autocorrelation receiver (QDAR) is developed. Unlike a RAKE receiver, the QDAR does not suffer from timing and template matching problems, and it also circumvents processing at high frequencies, thereby reducing the on-chip circuit complexity and power consumption, and offers an elegant solution to narrowband interference rejection. The figure of merit of auto-correlation receivers can be defined by the accuracy of the the time delay element. In this paper, a cyclic delay is designed as required for the autocorrelation function in the QDAR. A Pad´ e approximation is used to derive a rational transfer function of a unit delay filter (i.e., 9 th order). Finally the performance of the cyclic delay is evaluated through circuit level simulations.